i too will have got the 2 player battle box in a week (it went out of stock when i ordered)
im will be adding it to my khador army, but it wont stop me starting a small menoth force
menoth have a wide range of different units, my idea of menoth is loads of heavy infanty romaing the battlefield supported by warjacks
so i came up with a heavy infantry list
eKroess
Repenter
revenger
crusader
vanqusiher
5 cinerators
5 bastions
and a choir of menoth to keep the warjacks moving
this is a very good list which will work well with the battlebox
have go at trying different ones, after all its your army
good luck